Maths practice for 12-year-olds - page 252 of 347

Number of problems found: 6923

Gear train
A gear train is assembled from three gear wheels. The first has 165 teeth, the second 132 teeth, and the third 231, where the second engages with the first and the third with the second. The first and third do not touch. How many times per minute will all
Car distance
The car will travel 28 km in one hour. How far will it travel in two and a half hours?
Holiday trip
Paul is saving for the holiday trip. He received 1100 CZK from his father. He saved a fifth and received the rest 500 CZK from his mother. How much did his holiday trip cost?
Warmer weather
This morning the temperature was -6 °C. What was the temperature yesterday if it was three times warmer?
Football field area
A football field for an interstate match must be between 100 m and 110 m long and between 64 m and 75 m wide. Calculate the area of the smallest and largest fields corresponding to the conditions.
Combine / add term
Combine like terms 4c+c-7c
Container
The container has a cylindrical shape, the base diameter is 0.8 m, and the area of the base is equal to the area of the wall. How many liters of water can we pour into the container?
Excavation
The excavation for the cottage's base measures 4.5 m x 3.24 m x 60 cm. The excavated soil will increase its volume by one-quarter. Calculate the volume of excavated soil.
Missing pupils
There are 32 pupils in the class. How many pupils were missing from school if 12.5% were absent?
Box metal
A box is shaped like a cube with an edge of 52 cm. How many m² of sheet metal are needed to make the box with a lid? Add 5% for the folds of the lid and walls.
Computer course
There are 32 pupils in the class. A quarter of them attend a computer course. What percentage of the total number of students in the class do not attend a computer course?
Lunch cost
In a specific Czech company, each employee pays 40% of the lunch price, and the remaining CZK 33 is contributed by the employer. What is the cost of lunch?
Departure time
The truck arrived in Brno at 6 pm, 14 minutes and 50 seconds. The journey took 5 hours, 17 minutes 20 seconds. What time did the truck go?
Water flow
120 hl of water flows out of the tank through 4 pipes in 16 hours. How much water flows through 5 identical pipes in 14 hours?
Image reduction
To say that I am mathematically challenged is a gross understatement! I'm trying to help my friend determine how to calculate percentages of reduction or enlargement for a quilt pattern. She is creating a drawing of a cute picture that will become a piece
Wheel revolutions
The diameter of the motorcycle wheel is 60 cm. How many times does the wheel turn on a track 1,884 km long?
Paper production
About 50% of the pulp is obtained from wood and about 65% from paper. How many tons of paper can we make from 150 tons of wood?
Family equation
father + mom = children How many solutions does this problem have?
Gardens colony
The garden's colony, with dimensions of 180 m and 300 m, is to be completely divided into the same large squares of the highest area. Calculate how many such squares can be obtained and determine the length of the square side.
The buns
Kate, Zofia, and Peter liked the buns. Even today, their grandmother prepares their favorite meal. Kate eats four bunches, Sophie 3, and Petra eats five buns. Their grandmother said, "My inmate, will you know how many buns I have been made today if those

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